Cotton-saw gummer.



DE WITT G. NELSON.

COTTON SAW GUMMER.

APPLICATION FILED P234, 1913.

Patented Sept. 2, 1913.

INVENTOR DeMfz.0./Velson.

ATTORNEY in s'ra'rns PATENT OFFICE.

DE WITT C. NELSON, OF DALLAS, TEXAS, ASSIGNOR F ONE-HALF T0 JOHN H.NICHOLS, 0F DALLAS, TEXAS.

COTTON-SAW GUMMER.

Specification of Letters Yatent.

Application filed February 7, 1913.

Patented Sept. 2, 1913.

Serial No. 746,935.

To all whom it may concern:

Be it known that I, DE \Vrr'r C. NELSON, a citizen of the United States,residing at Dallas, in the county of Dallas and State of Texas, haveinvented certain new and useful Improvements in Cotton-Saw Gummers, ofwhich the following is a specification.

This invention relates jiarticularly to certain new and usefulimprovements in cotton saw guminers.

The object of the invention is to provide certain advantageous partswithout changing the general construction and operation of the sawgummer now in common use. The parts involved are; an e'tlicientfastening for the dies; a particular form of out ter whereby a cuttinginstead of a punching action will be had; means for adjusting the cutterto change the angle at which its cutting edge attacks the work; and animproved gage for regulating the depth of the out.

A still further object of the invention is to provide a device of thecharacter de scribed that will be strong, durable, eflicient, and simpleand con'iparatively inexpensive to construct, also one in which theseveral parts will not be likely to get out of working order,

\Vith the above and other objects in view the invention has relation tocertain novel features of construction and operation, an example ofwhich is described in the following specification and illustrated in theaccompanying drawings, wherein:

Figure 1 is a side elevation of the gumnier in position on a saw, Fig. 2is a plan view of the same, Fig. 3 is a side elevation opposite to Fig.1, Fig. i is an elevation of the cutter, F 5 is a plan of the same, Fig.6 is a transverse sectional view on the line of Fig. 2, Fig. 7 is adetail of the shoe, and Fig. 8 is a detail in cross section on the linea -a of Fig, 3.

In the drawings the numeral 1 designates the base of the gummer, in theforward end of which is formed a slot 2 to receive the edge of the sawto be gummed. A bar 3 extending on the base has its rear end pivoted tothe base. A head 4 is provided on the forward end of the bar and formedwith a recess 5, and an under bevel portion 6 as shown in Fig. 3. Thebase 1 has a boss 7 at one side pivotally supporting a handle lever 8having a cam head 9 which engages a cam lug 10 projecting from theadjacent side of the bar 3. In the base a pitman 11 is mounted to slideunder the bar 3 and its lug. This pitinan has an upstanding lug 12 inthe path of a linger 14 projecting laterally from the lever 8. Thepitman extends rearwardly along one side of the bar 3 and 1s pivoted tothe upper end of a spring pressed bell-crank lever 15 supportei'l by thebase as shown in Fig. 1.. The opposite end of the lever 15 pivotallysupports a depending dog 16 having its lower end bifurcated and adaptedto engage the teeth of a saw as shown. An arm 17 is pivoted to theforward end of the base 1 at one side and carries a shoe 18 at its freeend adapted to engage over the teeth of the saw as shown. A handle 19 issecured to the rear end of the base. The parts described to this pointare merely set forth as an explanation of the machine with which myinvention is combined.

Ileretofore the dies in this class of machines have given considerabletrouble by constantly becoming loose and I propose to eliminate thistrouble. Adjacent the head 1; of the bar 3 a recess 20 is offset fromthe slot 9. opposite the head 4- as shown in Figs. 2, (3 and 8. In thisrecess dies 21 and 22 are vertically disposed, the die 22 having itsupper end projecting above the base 1 and inclined as shown in Fig. 3,the beveled portion 6 of the bar 3 swinging over said die. The other die21 is wedge-shaped being inserted from the top of the base andprojecting above and below the same as shown.

As best shown in Fig. 8, the die 21 has a specially shaped recess 23 inits outer face adapted to receive a wedgekey 24L which impinges theunder face of the base 1 and 'lrictionally fastens the die 21 in place,which latter holds the die 29. in position. The wedgekey provides asimple fastening readily adjusted and easily placed and removed.

Another feature of the invention resides in providing a cutter carriedby the head 1 and cooperating with the dies whereby a cutting action andnot a punching action is had. T he rear face of the cutter rests flatagainst the flat face of the wall of the head 1. I/Vhere the cuttingside of the cutter is flat, said cutter will punch out metal, but notout, and greater power is required for the punching. The cutter 25 ismade reversible thin edge, the rib 27 being retained as a strengtheningand reinforcing means. The

cutting edge 28 is produced by beveling the 1 positioned'so that the sawis received in the side of the cutter in two directions at substantiallyright angles whereby said cutting edge 1s lncllned lnwardly in adownward direction and also rearward toward its center,referen-ce beinghad to the lower end of 2 guinmer is held against the action of 1ts thecutter Figs. 4t and 6.

When the cutter 25 is placed in the recess 5 of the head 4 as shown inFig. 6 and the bar 3 swung to move the cutter across the saw standing inthe slot 2, the upper portion of the inclined cutting edge 28 will firstattack the saw, and as the movement is con- '1 tinued the cutting edgewill gradually enter the saw and complete a cutting action of a shearingnature.

It is apparent that metals of difierent thickness and degree of hardnesswould re quire more or less power to be exerted on the cutter, but themore gradually the cutter entered the metal, less power proportionatelywould be required.

The cutter 25 is held in the recess 5 of the head a by a pivot screw 29which has its end engaging in a shallow recess 40 in the face of thecutter and permitting the same to be swung laterally. Two screws 30 passtransversely through the head relatively above and below the pivot screwand impinge the side of the cutter as shown in Fig. 6. It is obviousthat by adjusting these screws the cutter may be tilted or swunglaterally or transversely of the head whereby the angle of inclinationof the cutting edge 28 is adjusted.

It is apparent that the cutter 25 resting against the flat wall of thehead 4 is held in contact therewith by the screw 29 which has its endengaged in the recess 40 of the cutter, and said cutter cannot bedisplaced laterally from its pivot position by the pressure of thescrews 30.

At the shearin side of the cutter a gage 31 is supported in a keeper 32adjustable on the side of the head 4. As shown particularly in Fig. 3,the gage is not as thick as the cutter and has its lower end beveled andshaped to conform'to the cutter. When the gummer is on the saw the gagerests in the crotch between adjacent teeth and the distance between thelower end of the gage and slot 2. Theshoe 18 is engaged over the teethas shown and suitable connection made between a weight on the floor v(not shown) and a button 33 on the arm 17, whereby the feed.

The operator grasps the handle 19 and the handle-lever 8 and by swingingthe latter outward causes the bar 3 to swing the cutter 25 across thesaw thus sharpening or recutting the tooth. The lever is swung back anda spring 34 serves to return the bar to its normal position. As thelever is swung back the finger 14: engages the lug 12 and drives thepitman 11 forward whereby the bell-crank lever 15 is swung and throughthe agency of the dog 16 steps the saw a distan-cc of one tooth, thusbringing the next tooth to be cut, into position in the slot 2.

What I claim, is:

1. The combination in a saw gumm'er, of a base having a saw receivingslot at one end, a bar arranged to swing on the base transversely of thesaw receiving slot, a cutter carried by the bar in proXimitiy to theslot and presenting an inclined cutting edge, said cutter beingpivotally sustained, adjusting devices engaging the cutter relativelyabove and below its pivot point, and

an operating member mounted on the base and engaging the bar.

2. The combination with a circular saw, of a saw gummer comprising, abase having a slot receiving the saw, a cutter support arranged on thebase to swing transversely of the slot, a cutter carried by the supportpresenting a cutting edge inclined to the vertical plane of the saw, andmeans for varying the angle of inclination of the cutting edge of thecutter.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

DE VVITT C. NELSON. Witnesses D. B. CARR, J. S. MURRA Copies of thispatent may be obtained for five cents each, by addressing theGommissioner of Patents;

Washington, I). C.

